code: def setUp(self) -> None:
      self.temp_dir = tempfile.mkdtemp(
          prefix="TestModelCheckpointingCallback"
      )
  
file_path: headliner/tests/callbacks/test_model_checkpointing_callback.py
imports: import shutil
  import tempfile
  import unittest
  import os
  from unittest.mock import Mock, call
  from headliner.callbacks.model_checkpoint_callback import ModelCheckpointCallback
label_desc: Use image node_id 1 for calling the TestModelCheckpointCallback obj's underlying member method code with example usage: obj.setUp() without return types